FreeStyle Libre Sensor
Please note that FreeStyle Libre sensors have a 5 to 6 months expiration date.
*Sensor dimensions 35 mm x 5 mm and weigh 5 grams.
FreeStyle Libre sensor provides glucose readings for up to 14 days once applied.
Apply the sensor
The FreeStyle Libre sensor is applied on to the back of the upper arm with a simple, disposable device called an applicator. When the sensor is applied, a thin, flexible and sterile fibre is inserted just under the skin. It is held in place with a small adhesive pad. Most people feel no pain when applying the sensor.1
To obtain a glucose reading, simply perform a quick, painless, 1-second scan of your smartphone using the FreeStyle LibreLink app or the FreeStyle Libre reader over the sensor. Each scan gives you more information than monitoring with blood glucose test strip, without the need for routine finger pricks†. The FreeStyle Libre system also offers software to generate concise reports to assist with the analysis of glucose data.
Each scan of the FreeStyle LibreLink app or FreeStyle Libre reader over the sensor gives a current glucose reading, the last 8-hours of glucose history, and a trend arrow showing if glucose is going up, down, or changing slowly. The reader can even scan through clothing with a thickness of up to 4 cm.2
Please note that FreeStyle Libre sensors have a 5 to 6-month expiration date.
Q: Does the FreeStyle Libre system need to be calibrated?
No, the FreeStyle Libre sensor is calibrated during the manufacturing process so you don't have to. The sensor is activated by scanning and then, after a 1 hour warm up period, it starts to record glucose readings continuously6.
Q: Is FreeStyle Libre accurate?
The FreeStyle Libre system is clinically proven to be accurate, stable and consistent over 14 days compared to blood glucose testing without the need for finger prick calibration In a clinical study, the FreeStyle Libre system achieved 11.4% Mean Absolute Relative Difference (MARD) compared to blood glucose testing 99.7% of glucose results fall within Zone A and Zone B of the Consensus Error Grid, when compared against blood glucose testing. The measurement errors associated with these zones have no effect on clinical action and little or no effect on clinical outcomes .
Q: Is interstitial fluid an adequate replacement to blood glucose testing?
Interstitial fluid-based glucose readings are a reliable indicator of blood glucose levels.
The physiological lag in ISF glucose, with respect to changes in blood glucose, is about 5-10 minutes5. The average lag time of the FreeStyle Libre system is approximately 5 minutes, which is unlikely to impact routine day-to-day treatment decisions4,5.
1 Most people did not feel any discomfort under the skin while wearing the FreeStyle Libre sensor. In a 2013 US study conducted by Abbott Diabetes Care, 93.4% of patients surveyed (n=30) strongly agree or agree that while wearing the sensor, they did not feel any discomfort under their skin. [29 persons have finished the study; 1 person terminated the study after 3 days due to skin irritations in the area where the sensor touched the skin.] Data on file. 2 The reader can capture the data from sensor when it is placed between 1cm to 4cm from sensor, even through clothing. 3 Bailey, T, et al. The Performance and Usability of a Factory-Calibrated Flash Glucose Monitoring System. Diabetes Technology and Therapeutics v17 n11 July 2015 (10.1089/dia.2014.0378) 4 Parkes J, Slatin S, Pardo S, et al. A new consensus error grid to evaluate the clinical significance of inaccuracies in the measurement of blood glucose. Diabetes Care. 2000;23(8):1143-1148. 5 Rebrin K, Sheppard NF Jr, Steil GM. Use of subcutaneous interstitial fluid glucose to estimate blood glucose: revisiting delay and sensor offset. J Diabetes Sci Technol. 2010;4(5):1087-1098.
|Sensor size||5 mm height and 35 mm diameter|
|Sensor weight||5 grams|
|Sensor power source||1 silver oxide battery|
|Sensor life||Up to 14 days|
|Sensor memory||8 hours (glucose readings stored every 15 minutes)|
|Sensor operating temperature||10°C to 45°C|
|Sensor applicator and sensor pack storage temperature||4°C to 25°C|
|Operating and storage relative humidity||10%-90%, non-condensing|
|Sensor water resistance||IP27: Can withstand immersion into one metre (3 ft) of water for up to 30 minutes|
|Operating and storage altitude||-381 metres (-1,250 ft) to 3048 metres (10,000 ft)|